Disaster recovery and the term structure of dividend strips?
Michael Haslera,∗ Roberto Marf`eb
Journal of Financial Economics, forthcoming
aUniversity of Toronto, 105 St. George Street, Toronto, ON, M5S 3E6, Canada.
bCollegio Carlo Alberto, Via Real Collegio, 30, 10024 Moncalieri (Torino), Italy.
Abstract
Recent empirical findings document downward-sloping term structures of equity return volatility and risk premia. An equilibrium model with rare disasters followed by recoveries helps recon- cile theory with empirical observations. Indeed, recoveries outweigh the upward-sloping effect of time-varying disaster intensity and expected growth, generating downward-sloping term structures of dividend growth risk, equity return volatility, and equity risk premia. In addition, the term structure of interest rates is upward-sloping when accounting for recoveries and downward-sloping otherwise. The model quantitatively reconciles high risk premia and a low risk-free rate with the shape of the term structures, which are at odds in other models.
JEL classification: D53; D51; E21; G12; G13
Keywords: Recovery; Rare disasters; Term structures of equity; Dividend strips; Asset pricing puzzles
?We would like to thank Ilaria Piatti, European Finance Association (EFA) meeting 2015 discussant, G. William Schwert (the editor), and an anonymous referee for comments that significantly improved the quality of the paper. We also would like to acknowledge comments from Giovanna Nicodano, Julien Penasse, and conference participants at the EFA meeting 2015. Financial support from the University of Toronto, the Connaught New Researcher Award, and the Collegio Carlo Alberto is gratefully acknowledge.
∗Corresponding author. Tel.: +1 (416) 946-4014. Email address: [email protected]
1 1. Introduction
Recent empirical studies show that the term structures of dividend growth risk, equity return volatility, and equity risk premia are downward-sloping (van Binsbergen, Brandt, and Koijen, 2012; van Binsbergen, Hueskes, Koijen, and Vrugt, 2013).1 These findings are particularly important because they question the validity of the most successful asset pricing models. Models featuring time-varying disaster risk (Gabaix, 2012; Wachter, 2013) or time-varying expected growth (Bansal and Yaron, 2004) provide convincing foundations for the observed properties of equity return volatility and risk premia, but they assume term structures of dividend growth volatility and, in turn, imply term structures of equity return volatility and risk premia that are inconsistent with the data. In this paper, we account for the empirically supported fact that dividends recover after disasters (Gourio, 2008; Nakamura, Steinsson, Barro, and Ursua, 2013). While either natural or man-made disasters affect both physical and, to a lesser extent, human capital, disaster recovery is easy to understand by means of knowledge conservation. Available technology and know-how allow accelerated post-disaster economic growth. Capital accumulation is easier the second time around because it replicates a known investment pattern. Moreover, disasters induce government spending to stimulate the economic environment and foster competition.2 We show that disaster recovery helps explain the observed shape of the term structures of equity return. We provide theoretical evidence that recoveries kill the upward-sloping effect of both time-varying disaster risk and time-varying expected growth. The reason is that, in the presence of recoveries, the volatility of dividend growth is larger in the short term than in the long term. In equilibrium, the properties of dividend growth volatility transmit to
1See van Binsbergen and Koijen(2016) for a recent survey on the term structures of equity return.
2While debate is ongoing about the short-run and long-run impacts of disasters on economic growth, developed economies, such as the US, seem to be able to mitigate adverse effects and exploit growth oppor- tunities. See Cavallo, Galiani, Noy, and Pantano(2013) and references therein.
2 stock returns and imply empirically consistent downward-sloping term structures of equity return volatility and risk premia. We base our model on three important properties of the joint dynamics of consumption and dividends for which we provide evidence. First, dividends scaled by consumption are stationary, i.e. consumption and dividends are co-integrated (Lettau and Ludvigson, 2005). Second, the term structure of consumption growth volatility is slightly upward-sloping, and that of dividend growth volatility is markedly downward-sloping (Marf`e, 2016). This het- erogeneity in the timing of fundamental risk is key to understanding the shape of the term structures of equity return. Third, conditional on a disaster, dividends drop more and recover faster than consumption (Longstaff and Piazzesi, 2004), validating the theoretical predictions of Gourio(2012). These stylized facts are closely related to each other. Co-integration implies that con- sumption and dividends face the same permanent shock and that the dividend share of consumption is stationary. However, the dividend share of consumption moves negatively with disasters and positively with recoveries. This implies that disasters are (at least par- tially) transitory shocks and that dividends drop more and recover faster than consumption. The levered exposition of dividends to transitory risk helps explain the gap between the upward-sloping term structure of consumption growth risk and the downward-sloping term structure of dividend growth risk. We consider a pure-exchange economy (Lucas, 1978) with a representative investor who has Epstein and Zin(1989) preferences. To model the joint dynamics of consumption and dividends, we consider a rare disaster model with time-varying disaster intensity (Wachter, 2013) and expected growth (Bansal and Yaron, 2004). The key feature of our model is that recoveries take place right after the occurrence of a disaster (Gourio, 2008). We argue that, even though disaster intensity risk and long-run risk imply empirically inconsistent term structures of equity return, extending these models with plausible recoveries helps explain
3 simultaneously several important properties of dividends, consumption, and asset prices.3 We show that the presence of recoveries implies a markedly downward-sloping term struc- ture of dividend growth volatility. The reason is that, in the short term (e.g., one day), the dividend faces disaster and expected growth risk, but the horizon is too short to benefit from a significant recovery. In the long term (e.g., 20 years), disaster and expected growth risk are still present, but dividends have a significant amount of time to recover. However, the speed of consumption recovery is not high enough to outweigh disaster intensity risk and expected growth risk, both of which imply a large amount of risk in the long term. Therefore, the term structure of consumption growth volatility is slightly upward-sloping. In equilibrium, equity returns inherit the properties of dividend growth rates. Therefore, the term structure of equity return volatility and risk premia are, as the term structure of dividend growth volatility, downward-sloping in our model. To understand the dynamic patterns of the term structures of equity return over the business cycle, we define bad (good) economic times as states of the world in which the disaster intensity is high (low). Consistent with van Binsbergen et al.(2013), we show that the slopes of the term structures of equity return are pro-cyclical in our model, being smaller in bad times than in good times. The reason is that, in bad times, the disaster intensity is large and is consequently expected to revert back down to its mean in the long term. This implies a significantly larger amount of risk in the short term than in the long term and, therefore, steep downward-sloping term structures of equity return. In good times, however, the disaster intensity is small and eventually reverts back up to its long-term mean. That is, disaster intensity risk is larger in the long term than in the short term. This dampens the downward-sloping effect of recoveries and implies flatter term structures of equity return. The properties of the term structures of equity return hold even for an elasticity of intertemporal substitution (EIS) smaller than
3Consistent with the international evidence presented by Gourio(2008) and Nakamura et al.(2013), our calibration implies that consumption partially recovers after large drops (by about 50%) in about five years. This is the joint result of long-run growth and after-disaster excessive conditional growth.
4 one.4 The reason is that returns inherit the properties of cash flow growth rates as long as the EIS is larger than some lower bound. This lower bound turns out to be smaller than one for equity –the dividend claim– because dividends have a levered exposition on disaster risk. In line with empirical findings, the risk-free rate is about 0.6% and equity risk premia are about 6.5%. The model generates relatively large risk premia because, in the presence of recoveries, risk premia decrease with the elasticity of intertemporal substitution (Gourio, 2008).5 Moreover, the ability of the model to solve the risk-free rate and equity premium puzzle and simultaneously capture the negative slope of the term structures of equity return is robust to the setting of investors’ preferences. We show that our results hold for an elasticity of intertemporal substitution in the range (0.5,2) and for a coefficient of relative risk aversion in the range (4.4,6.6). Furthermore, we show that recoveries help explain the observed shape of the term struc- ture of real interest rates. The term structure of interest rates is upward-sloping in the presence of recoveries, and it is downward-sloping when disasters are permanent. The rea- son is that the term structure of consumption growth risk is significantly less upward-sloping in the presence of recoveries. Because bonds are used to hedge consumption growth risk, bond yields increase with maturity when there are recoveries and decrease with it when disasters are permanent. Finally, the model implies an inverse relation between the cur- rent price-dividend ratio and future excess returns, in line with the empirical findings of Cochrane(2008) and van Binsbergen and Koijen(2010). The predictive power, however, decreases with the forecasting horizon because predictability comes mainly from transitory sources of risk in our model. Our model builds on the literature about rare disasters (Tsai and Wachter, 2015). Models
4A major critique of long-run risk and rare disasters models is their reliance on a large elasticity of intertemporal substitution (Epstein, Farhi, and Strzalecki, 2014).
5If disasters are fully permanent, then risk premia increase with the elasticity of intertemporal substitu- tion.
5 featuring time-varying risk of disasters provide a theoretical explanation of a number of price patterns (Gabaix, 2012; Wachter, 2013) and have found empirical support (as in Berkman, Jacobsen, and Lee(2011), among others). We complement this literature by pointing out the importance of recovery (Gourio, 2008) and focusing on the otherwise puzzling term structures of both fundamentals growth and equity return. Because our results rely on the existence of recoveries, our paper is closely related to the findings of Nakamura et al.(2013) who fit a rare disasters model to international consumption data and provide evidence that consumption disasters unfold over a few years and that consumption recovers by about 50% in the following five years. They show that the presence of recoveries significantly decreases equilibrium risk premia on the consumption claim and that reasonably large risk premia can be obtained only if the elasticity of intertemporal substitution is large. In contrast with their study, in our model the dynamics of consumption and dividends are heterogeneous and we focus on the impact of recoveries on the term structures of consumption growth risk, dividend growth risk, equity return volatility and risk premia, and interest rates. We show that, because dividends are more sensitive to disasters and recoveries than consumption, the shape of each of the five term structures is consistent with empirical findings. A few recent papers investigate the properties of the term structures of dividend growth risk and equity return. Ai, Croce, Diercks, and Li(2012), Belo, Collin-Dufresne, and Gold- stein(2015), and Marf`e(2014) focus, respectively, on investment risk, financial leverage, and labor relations. These macroeconomic channels contribute to endogenize the downward- sloping term structure of dividend growth risk and, in turn, of equity return. This paper differs from these studies because it focuses on an endowment economy in which dividends feature time-varying disaster risk and recover after the occurrence of a disaster. The model calibration provides support to the idea that the disaster-recovery channel has a potentially sizable quantitative impact on asset price dynamics. Other theoretical studies that help ex- plain the shape of the term structures of equity return focus on non standard specifications
6 of beliefs formation and preferences. These are proposed by Croce, Lettau, and Ludvigson (2015) and Berrada, Detemple, and Rindisbacher(2013), respectively. In addition, Lettau and Wachter(2007, 2011) show in a partial equilibrium setting that a pricing kernel which enhances short-run risk can help to simultaneously explain the shape of the term structures of equity return and the cross-sectional value premium. Similar to Marf`e(2014), our equi- librium framework allows us to endogenize the pricing kernel and to provide an economic rationale for the intuition provided in Lettau and Wachter(2007, 2011). As in Longstaff and Piazzesi(2004), we assume that the dividend share of consumption is stationary. While they focus on the relation between the dynamics of corporate cash flows and equity risk pre- mia, we are concerned with the impact of recoveries and recursive preferences on the term structures of equity return. The remainder of the paper is organized as follows. Section2 provides empirical support to the main assumptions and economic mechanism. Section3 presents and solves the model. Section4 describes the term structures of consumption growth risk, dividend growth risk, equity return volatility and risk premia, and interest rates. Section5 presents the term structures of equity return when disasters unfold over a few years and Section6 concludes. Derivations are provided in the Appendix.
2. Empirical support
Gourio(2008) provides evidence that rare disasters are followed by recoveries. This means that, after large drops, gross domestic product and consumption growth feature a conditional mean that is larger than the unconditional one. Such evidence suggests that, in contrast with what is usually considered in the literature, rare disasters should be modeled, at least partially, as transitory shocks instead of permanent shocks. More recently, Nakamura, Steinsson, Barro, and Ursua(2013) provide international evidence that disasters unfold over a few years and then partially recover. Whether disasters have a transitory or permanent
7 nature and whether they take place slowly or rapidly are key to the extent of modeling the term structure of risk of macroeconomic fundamentals, i.e., the volatility of growth rates computed over different time horizons or the corresponding variance ratios. Belo, Collin-Dufresne, and Goldstein(2015) and Marf`e(2014, 2016) show that aggregate dividend growth is characterized by a markedly downward-sloping term structure of risk and that aggregate consumption growth features a slightly upward-sloping term structure of risk. The corresponding variance ratios are reported in Fig.1. The different shape of the two term structures can be interpreted as follows. Assume that both consumption and dividends are driven by a permanent and a transitory shock (Lettau and Ludvigson, 2014). These shocks can feature time-varying expected growth, volatility or jump intensity. Variations in the conditional distribution of the permanent shock induce an upward-sloping effect, and variations in the conditional distribution of the transitory shock induce a downward-sloping effect. The combination of these two effects determines the shape of the term structures. As long as consumption and dividends are co-integrated (Lettau and Ludvigson, 2005), they share the same permanent shock but can be exposed differently to the transitory shock. In fact, such a heterogeneity in the exposure to transitory risk explains the difference between the shape of the term structure of consumption growth risk and that of dividend growth risk. Consumption loads to a lesser extent on the transitory shock than dividends do. Therefore, the upward-sloping effect dominates in the case of consumption and the term structure of consumption growth risk increases with the horizon. In contrast, the downward-sloping effect dominates in the case of dividends and the term structure of dividend growth risk decreases with the horizon. An implication of this mechanism is that the dividend share of consumption is stationary and increases with the transitory shock.
[Insert Fig.1 about here.]
In what follows we provide empirical support to the previous interpretation and relate it to the role of disasters and recoveries. Panel A of Table1 reports summary statistics
8 about real consumption and dividends. Data are from the National Income and Products Accounts (NIPA) tables 1.1.6, 1.1.10, and 1.11 and concern the aggregate US economy on the sample 1929–2013 at yearly frequency. Consumption and dividend growth rates share a similar unconditional mean, but the former is smoother than the latter. Consumption growth is positively autocorrelated, and dividend growth is negatively autocorrelated. In addition, consumption and dividend growth rates are positively but imperfectly correlated. The excess volatility of dividend growth rates, their negative autocorrelation, and their imperfect correlation with consumption growth rates are three stylized facts consistent with the idea that dividends load more than consumption on a transitory shock. The dividend share is small on average, smooth, relatively persistent, and negatively correlated with the one-period ahead growth rates of consumption and dividends. This is also consistent with the idea that the dividend share is increasing with the transitory component of consumption and dividends.
[Insert Table1 about here.]
In Panel B, we perform a Johansen test of co-integration in a vector error correction model (VECM). Both the Schwarz Bayesian (SBIC) and the Hannan and Quinn (HQIC) information criteria suggest that consumption and dividends are co-integrated. We should reject the null hypothesis of no co-integrating equations, and we cannot reject the null hypothesis of one co-integrating equation.6 Consistent with the property of co-integration, Panel C shows that the dividend share is stationary. The coefficient obtained by regressing the change in the dividend share on its lagged value is negative and significant (the Newey-West t-statistics is −3.74). In accord with our interpretation, co-integration implies that the negative slope of dividend growth variance ratios is due to the excessive exposition of dividends to transitory risk.
6This result is robust to the lag and trend specifications and also holds when using postwar data only.
9 The upper graphic of Fig.2 shows the time series of the logarithm of aggregate dividends and highlights the rare disaster events defined as growth rates smaller than two standard deviations below the average. Consistent with Gourio(2008) and Nakamura, Steinsson, Barro, and Ursua(2013), we observe that a substantial recovery occurs during the years following the rare events. The middle graphic of Fig.2 shows the time series of the dividend share of consumption. We observe that the dividend share moves negatively with disasters and positively with recovery. We show this more formally in Panel D of Table1. We construct a disaster-period dummy (Dis) that is equal to one during years in which growth is smaller than two standard deviations below the average as well as during the subsequent negative growth years. In addition, we construct a recovery dummy (Rec) that is equal to one the year following a disaster. Because the dividend share is stationary, it cannot depend on the permanent component of consumption and dividends. Therefore, the fact that coefficients associated to the dummy variables Dis and Rec are statistically significant provides evidence that the event of a disaster followed by a recovery is (at least partially) transitory. Moreover, the coefficients are respectively negative and positive, consistent with the idea that dividends drop more and recover faster than consumption when a disaster occurs.7
[Insert Fig.2 about here.]
The lower graphic of Fig.2 shows the time series of the (standardized) changes in the div- idend share and the predicted time series obtained by regressing the changes in the dividend share on the dummy variables Dis and Rec. The joint explanatory power of the dummy vari- ables Dis and Rec is large (adjusted R2 = 46%), meaning that the disaster/recovery path is
7Many asset pricing models, such as Wachter(2013) and Martin(2013), among others, assume that dividends load more on disasters than consumption does. This is consistent with the general equilibrium model of Gourio(2012) in which dividends are endogenous and with the empirical findings of Longstaff and Piazzesi(2004): “While aggregate consumption declined nearly 10% during the early stages of the Great Depression, aggregate corporate earnings were completely obliterated, falling more than 103%.”
10 a main driver of the dividend share dynamics. In turn, given the stationarity of the dividend share, the disaster/recovery path is a main driver of the transitory component of consump- tion and dividends. This helps explain why dividend growth is riskier than consumption growth at short horizons and why the term structures of dividend and consumption growth risk are downward-sloping and upward-sloping, respectively. Overall, we observe seven stylized facts: (1) the timing of dividend growth risk is markedly downward-sloping; (2) the timing of consumption growth risk is slightly upward-sloping; (3) dividend growth is riskier than consumption growth at short horizons; (4) dividends and consumption are co-integrated; (5) disasters are followed by recoveries; (6) dividends load more on disaster risk than consumption does, and (7) the dividend share moves with disasters and recoveries. In Section3, we present a model that captures the seven stylized facts as well as the partial recovery property shown by Nakamura, Steinsson, Barro, and Ursua(2013). In Section4, we show that the model can simultaneously explain several observed properties of asset prices such as the downward-sloping term structures of equity return volatility and risk premia, the pro-cyclical dynamics of their slopes, the upward-sloping term structure of interest rates, the low risk-free rate, and the high equity risk premia.
3. A model of rare disasters and recoveries
In this section, we first describe the economy and characterize equilibrium asset prices. Then, we calibrate the dynamics of aggregate consumption and dividends to capture the empirical patterns shown in Section2.
3.1. The economy
We consider a pure-exchange economy `ala Lucas(1978) populated by a representative investor with recursive preferences (Epstein and Zin, 1989). The investor’s utility function
11 is defined by
θ h 1−γ 1 i 1−γ dt θ dt 1−γ θ Ut ≡ (1 − δ )Ct + δ Et Ut+dt , (1)
where Ct is consumption, δ is the subjective discount factor per unit of time, γ is the coefficient of risk aversion, ψ is the elasticity of intertemporal substitution (EIS), and θ =
1−γ 1 . 1− ψ
Aggregate consumption, Ct, and the dividend paid by equity, Dt, are characterized as
log Ct = xt + z1t (2) and
log Dt = xt + z2t + log d0, d0 ∈ (0, 1), (3)
with
1 2 dxt = (µt − 2 σx + ωz1t)dt + σxdWxt, (4)
dz1t = − φzz1tdt + ξtdNzt, (5)
dz2t = − φzz2tdt + αξtdNzt + σzdWzt, (6) ¯ p dλt = φλ(λ − λt)dt + σλ λtdWλt, (7) and
dµt = φµ(¯µ − µt)dt + σµdWµt, (8)
> where (Wxt,Wzt,Wλt,Wµt) is a standard Brownian motion and Nzt is a Poisson process
with stochastic intensity λt. The jump size ξt follows a negative time invariant exponential
12 distribution with parameter η. That is, the jump size is negative and characterized by the moment-generating function
1 uξt %(u) ≡ Et e = u . (9) 1 + η
The log-consumption and log-dividend processes consist of two components. The first, xt, is the growth rate had there been no disasters and consequently no recoveries either. The aim of the second component, zit, i ∈ {1, 2}, is to model disasters and recoveries. Conditional on the occurrence of a disaster (dNzt = 1), the log-consumption and log-dividend drop instantaneously by an amount ξt and αξt, respectively. Following the drop, the process zit reverts back to zero at speed φz and, therefore, implies a recovery in both consumption and dividends. If the mean-reversion speed φz is equal to zero, there are no recoveries and
8 disasters are permanent. The above dynamics show that if α = d0 = 1 and σz = 0, then consumption is equal to dividends.
Because the permanent shock xt is a common driver of log Ct and log Dt, consumption and dividends are co-integrated in levels, as observed in the data. To obtain an upward-sloping term structure of consumption growth volatility and realistic equity risk premia, we consider time variation in expected growth µt (Bansal and Yaron, 2004). As long as φz > 0, a disaster is followed by a recovery, but the recovery is only partial (Nakamura, Steinsson, Barro, and
Ursua, 2013) because disasters induce a permanent drop through the expected growth of xt (ω > 0). In addition, the model embeds a levered exposition of dividends to disasters (α > 1). This assumption produces three properties: (1) although dividends and consumption are co- integrated, dividend growth is more volatile than consumption growth at short horizons; (2) the term structure of dividend growth risk is downward-sloping because α > 1 allows the
8Nakamura, Steinsson, Barro, and Ursua(2013) point out that disasters are not necessarily instantaneous. We keep the model simple here and do not account for “slow” disasters because they do not alter the main qualitative result of the paper, that is, recoveries imply downward-sloping term structures of equity return. However, we model “slow” disasters and discuss their implications in Section5.
13 downward-sloping effect implied by recoveries to outweigh the upward-sloping effect implied
z2t−z1t by long-run risk and time-varying intensity; and (3) the dividend share Dt/Ct = d0e
9 decreases with disasters and increases with recoveries. The noise parameter σz is added to the dynamics of dividends because it helps to simultaneously match the consumption growth volatility, the dividend growth volatility, and the dividend share volatility observed in the data.10
3.2. Equilibrium
To solve for the prices of dividend strips, we follow the methodology presented by Eraker and Shaliastovich(2008), which is based on the Campbell and Shiller(1988) log linearization. The first step consists of characterizing the price of the claim to aggregate consumption, the state-price density, and, therefore, the risk-neutral measure. Then, the price at time t of a dividend strip with time-to-maturity τ is obtained by computing the expected present value
under the risk-neutral measure of a dividend Dt+τ paid at time t + τ. Recursive preferences lead to a non-affine state-price density. Therefore, we make use of the following log-linearization to preserve analytic tractability. The discrete time (continu- ously compounded) log-return on aggregate wealth V (e.g., the claim on the representative investor’s consumption) can be expressed as
V + C C t+1 t+1 vc,t+1 t+1 log Rt+1 = log = log (e + 1) − vc,t + log , (10) Vt Ct
where vc,t = log(Vt/Ct). A log-linearization of the first summand around the mean log
9 Provided that α > 1, this statement holds even though the speed of recovery φz is the same for both log-consumption and log-dividend.
10 Even with recursive utility, the risk associated with σz is not priced. This modeling assumption is intended to make unambiguous the relation between disasters and recoveries and equity risk premia.
14 wealth-consumption ratio leads to
Ct+1 log Rt+1 ≈ k0 + k1vc,t+1 − vc,t + log , (11) Ct
where the endogenous constants k0 and k1 satisfy